Question

Calcule x nas figuras abaixo

Answer 1

a.
$20 - x + 8x + 60 + 30 = 180 \\ 20 + 7x + 90 = 180 \\ 7x + 110 = 180 \\ 7x = 180 - 110 \\ 7x = 70 \\ x = \frac{70}{7} \\ x = 10$
b.
$25 + 2x + 15 + 6x - 20 = 180 \\ 25 + 15 - 20 + 2x + 6x = 180 \\ 20 + 8x = 180 \\ 8x = 180 - 20 \\ 8x = 160 \\ x = \frac{160}{8} \\ x = 20$